CVE-2026-33193 Docmost vulnerable to stored XSS via MIME type spoofing
Attackers can inject malicious scripts via MIME type spoofing in Docmost, compromising user sessions and data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-33193?
CVE-2026-33193 is a medium-severity cross-site scripting vulnerability in docmost, published on 14 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Docmost is open-source collaborative wiki and documentation software. Versions prior to 0.70.0 are vulnerable to a stored cross-site scripting (XSS) attack due to improper handling of MIME type spoofing (GHSL-2026-052). An attacker could exploit this flaw to inject malicious scripts, potentially compromising the security of users and data. Version 0.70.0 contains a patch.
Weakness: CWE-79
Which versions are affected by CVE-2026-33193?
It affects 1 product.
Products include Docmost Docmost.
How do I fix CVE-2026-33193?
No fix has been published for CVE-2026-33193 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-33193 being exploited?
There is no known exploitation of CVE-2026-33193 in the wild and no public exploit code.
Other vulnerabilities in docmost
- CVE-2026-24045 Docmost Affected by Stored XSS in Public Share Page
- CVE-2026-22249 Docmost affected by an Arbitrary File Write via Zip Import Feature (ZipSlip)
- CVE-2026-23630 Docmost is vulnerable to stored Cross-Site Scripting (XSS) through Mermaid rendering
- CVE-2025-55574 Cross-site scripting in n/a
- CVE-2026-40927 Docmost: XSS in Comments with JavaScript URI
Sources
Also known as GHSA-7cq4-577p-wp6p.